A new carbazole alkaloid, designated as glycoborinine, was isolated from the roots of Glycosmis arborea, along with two other known carbazole alkaloids, viz. glycozoline and glycozolidine, and two known quinoline alkaloids, viz. skimianine and 3-(3',3'-dimethylallyl)-4,8-dimethoxy-N-methylquinolin-2-one Its structure was elucidated mainly on the basis of its 2D NMR spectral analyses. (C) 1999 Elsevier Science Ltd. All rights reserved.